High-brightness color liquid crystal display panel employing light recycling therein

US6573961B2 · kind B2 · utility

Assignee

• Reveo, Inc. · US

Inventors

• Yingqiu Jiang · Sunnyvale, US
• Le Li · Hangzhou City, CN
• Aharon Hochbaum · Berkeley, US
• Sameer Dinkar Vartak · White Plains, US
• Hristina Galabova · Mamaroneck, US
• Richard Wiley · Los Altos, US
• Sadeg M. Faris · Pleasantville, US

Key dates

• Filing date: May 17, 1999
• Grant date: Jun 3, 2003
• Expiry date: May 26, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/40
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Reflective color filters using layers of cholesteric liquid crystals with two different center wavelengths and bandwidths per layer are stacked in two layers to provide colored light for displays. With a two layer stack circularly polarized light of one handedness can be provided. With a two layer stack circulary unpolarized colored light can be provided. With a broadband polarizing filter overlapping other filters in the stack a black matrix can be provided by reflecting all colors and transmitting no light in the overlapping areas. When broadband reflective cholesteric liquid crystals are used two primary colors can be reflected in the same pixel of a display making reflective layers with two reflective portions per layer possible. Color displays having three linear sub-pixels with three primary colors or with four sub-pixels of white, blue, green, and red in a pixel with two colors in a top row and two colors on a bottom row can are made with two colors per layer in two layer stacks. The pixels in the display are arranged such that multiple adjacent sub-pixels in a layer, or row in a layer, with the same color makes the color filters easier to manufacture. Displays using these r…